Bridge influence line identification method and system

An identification method and a technology of influence lines, applied in measuring devices, elastic tests, instruments, etc., can solve the problems of small and medium-sized bridges, such as safety assessment, repeated use, and high price

Active Publication Date: 2018-01-16
XIAMEN UNIV
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Problems solved by technology

A bridge system that is so expensive but cannot be reused between multiple bridges obviously cannot solve the safety assessment problem of small and medium bridges with a large volume and a wide area

Method used

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  • Bridge influence line identification method and system
  • Bridge influence line identification method and system
  • Bridge influence line identification method and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0128] Example 2: Real Bridge Verification

[0129] A simply supported cast-in-place prestressed concrete box girder bridge is used for the actual bridge verification of the influence line identification method. The bridge has a total length of 30.06m, a span of 25m, and a width of 42.5m. Bridge elevations and cross-sections Figure 6 shown, among them, attached Figure 6 The unit of medium size is cm, Figure 6 (a) represents an elevation view, Figure 6 (b) shows a cross-sectional view.

[0130] In the influence line detection test, the detection vehicle drives slowly along a certain lane and passes the bridge (see Figure 7 (a)), measure the movement of the vehicle and the strain and deflection responses of the key cross-section measuring points in the process. Such as Figure 7 As shown in (b), the test vehicle is a four-axle vehicle with a total weight of 716kN, the axle loads are 119kN, 119kN, 392kN and 392kN, and the distance between axles is 1.95m, 4.25m and 1.40...

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Abstract

The invention discloses a bridge influence line identification method and system. The method comprises the following steps: (1) a mathematic model for influence line identification is built; (2) influence line identification is performed based on a B spline curve. According to the method, actual measurement information of moving vehicles and bridge response caused by the moving vehicles is used, regularization theories and a B spline curve construction method are adopted, a problem that influence line identification is excessively sensitive to errors such as measurement noise and the like canbe effectively alleviated; the method is high in identification precision and great in potential for subsequent projection application; compared with a conventional method, the method can be used forinfluence line identification directly based on actually measured dynamic bridge response data, the method is simple and fast in operation, the method can be used for real time monitoring of key indexes of a bridge and can help effectively suppress influence line fluctuation which is not in line with physical meaning, and influence line identification precision can be improved.

Description

technical field [0001] The invention relates to the field of structural safety detection, in particular to a bridge influence line identification method and system. Background technique [0002] The bridge structure is expensive and has a long service life. During its service period of tens or even hundreds of years, due to the coupling effect of unfavorable factors such as environmental corrosion, material aging, and dynamic and static load effects, it will inevitably lead to structural damage accumulation and The resistance attenuation may even lead to catastrophic accidents in extreme cases. Therefore, how to ensure its safety and applicability within the service life cycle is a common concern of the government and society. According to the latest statistics of the transportation industry, there are 779,200 highway bridges in my country, including 3,894 large bridges, 79,500 large bridges, and 695,800 small and medium bridges, the latter accounting for nearly 90%. The ke...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M5/00
CPCY02T90/00
Inventor 陈志为杨维彪
Owner XIAMEN UNIV
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